Improvements in mechanical properties of a carbon fiber epoxy composite using nanotube science and technology |
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Authors: | Daniel C Davis Justin W Wilkerson Jiang Zhu Daniel OO Ayewah |
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Affiliation: | 1. Texas Institute for Intelligent Bio-Nano Materials and Structures for Aerospace Vehicles, Department of Aerospace Engineering, Texas A&M University, College Station, TX 77843, USA;2. NanoRidge Materials, Inc., Houston, TX 77023, USA |
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Abstract: | Carbon fiber reinforced epoxy composite laminates, with strategically incorporated fluorine functionalized carbon nanotubes (f-CNTs) at 0.2, 0.3 and 0.5 weight percent (wt.%), are studied for improvements in tensile strength and stiffness and durability under both tension–tension (R = +0.1) and tension–compression (R = −0.1) cyclic loadings, and then compared to the neat (0.0 wt.% CNTs) composite laminate material. To develop the nanocomposite laminates, a spraying technology was used to deposit nanotubes on both sides of each four-harness satin weave carbon fiber fabric piece for the 12 ply laminate lay up. For these experimental studies the carbon fiber reinforced epoxy laminates were fabricated using a heated vacuum assisted resin transfer molding (H-VARTM®) method followed by a 2 soak curing cycle. The f-CNTs toughened the epoxy resin-fiber interfaces to mitigate the evolution of fiber/fabric-matrix interfacial cracking and delamination under both static and cyclic loadings. As a consequence, significant improvements in the mechanical properties of tensile strength, stiffness and resistance to failure due to cyclic loadings resulted for this carbon fiber reinforced epoxy composite laminate. |
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Keywords: | Cyclic fatigue loading Composites Epoxy Carbon nanotubes Carbon fiber Functionalization |
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